提出一种机载合成孔径雷达(SAR)图像无控制点定位方法.该方法利用SAR图像辅助数据中的相关参数,依据大地坐标系其中一点的地理坐标以及两点之间的距离-方位关系进行直接的大地主题解算,将SAR图像定位问题转换为大地主题解算问题,实现直接定位.对影响定位精度的系统误差因素进行仿真分析.利用实际的机载SAR数据进行目标定位实验,结果验证了该方法的有效性.
A location method without reference points for air-borne SAR image is proposed. This method exploits related parameters in auxiliary data of SAR image, based on geographic coordinates of a point and the correlation of range-azimuth between this point to another point in the geodetic coordinate system, convert the problem of SAR image location to solution of geodetic problem. The effects on location precision caused by system error are studied. The experimental results on real-world SAR image validate effectiveness of the proposed method.
[1] 尤红建,丁赤飚,付琨. SAR图像对地定位的严密共线方程模型[J]. 测绘学报,2007,36(2): 158-162.
[2] Konecny G, Schuhr W. Reliability of radar image data [C]//16th ISPRS Con, Comm 3, 1988.
[3] Curlander J C. Location of pixels in space-borne SAR imagery[J]. IEEE Tran on Geosciences and Remote Sensing, 1982, 20 (3): 359-364.
[4] Curlander J C, Kwok R, Pang S S. A post-processing system for automated rectification and registration of space-borne SAR imagery[J]. Int J Remote Sensing, 1987, 8(4): 621- 638.
[5] Leberl F, Domik G, Kobrick M. Mapping with aircraft and satellite radar images[J]. Photogrammetric Record, 1985, 11(66): 647- 665.
[6] 常本义,高力. IECAS高分辨率机载合成孔径雷达几何精度试验[J]. 电子与信息学报,2006,28(5):945-949.
[7] 张笑微,张挺,王鑫,等. 无控制点条件下的SAR影像直接定位[J]. 测绘通报,2012(增刊):359-361.
[8] Pedlar D N, Coe D J. Target geolocation using SAR[J]. IEE Proc-Radar Sonar Navig, 2005, 152(1): 35-42.
[9] 韦北余,朱岱寅,吴迪,等. 一种基于和差波束的机载SAR定位方法[J]. 电子与信息学报,2013, 35(6):1 464-1 470.
[10] Vincenty T. Direct and inverse solutions of geodesics on the ellipsoid with application of nested equations[J]. Survey Review, 1975, 23(176): 88-93.
[11] Nelder J A, Mead R. A simplex method for function minimization[J]. The Computer Journal, 1965, 7(4): 308-313.
[12] Lagarias J C, Reeds J A, Wright M H, et al. Convergence properties of the Nelder-Mead simplex method in low dimensions[J]. SIAM Journal of Optimization, 1998, 9(1):112-147.
